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How to enable telnet client using PowerShell

Telnet is a quite useful connecitivity verification tool, especially during the system set up or troubleshooting. For some reason, mostly security concern, this feature is disabled since Windows Server 2008. But when you want a quick check, it’s really a pain to open the Server Manager and click, click, click… Fortunately we have PowerShell. So here is the one-line command to turn it on: